Greetings, I have a Wollensak convertible lens marked "Voltas Three Focus F8 8x10". It's m ounted in a Betax No. 4 shutter and is a good lens. The aperture scale says ind icates that it serves as a 12.5", 20", and 28.5" lens. It does not have a seria l number. Does anybody know the history of this lens? When was it manufactured ? I use it for B&W following the rules for convertible lenses, but am curious a bout its history. Thanks in advance. Jim Worthington
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